George frederick shaver



(Nol-Model.)

G. F. SHAVER.

TELEPHONE LINE CABLE.

No. 399,635. Patented Mar. l2, 1889.

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UNITED STATES PATENT OEEICE.,

GEORGE FREDERICK SIIAYER, OE NEIV YORK, Il. Y., ASSIGNOR TO TIIE Sl-IAVER CORPORATION, OE SAME PLACE.

TELEPHONE-LINE CABLE.

SPECIFICATION forming` part of Letters Patent No. 399,635, dated March l2, 1889.

Application filed July 5, 1888i Serial No. 279,053. (No model.)

T0 all whom it may concern.-

Be it known that I, GEORGE FREDERICK S'HAVER, a citizen of the United States, anda resident of New York, in the county of New York and State of New York, have invented certain new and useful improvements for the louder, clearer, and better transmission of sounds by Ineans of improved wires connected with telephonie instruments for the reception andimpartation of sounds, of which the following is a speciiication.

The object of my invention is to produce a greater volume of sound than has been heretofore attained, and to avoid the vibration and resonance that has hitherto occasioned a certain indistinctness of articulation in acoustic telephonie communication. In obtaining this result I employ a brous core surrounded by one or more metallic wires forming a cable or rope attached, in the usual Inanner, to such telephonie instrument and communicating sounds to and from the same, not limiting myself, however, to any particular form or construction of such rope or cable, employing any method of stretching` wire to and from such telephonieinstrument upon animpact of iiberinterlaid with wires. This fibrous core may be, and preferably should be, first saturated with any viscid or water repellent or preservative material. The advantages of this combination are, first, eliminating the resonance of metallic substances, when connected i with such an instrument,by means of an impact of softer materials, non-conductive of sound, around or upon which the metallic wires are wound or imposed; second, materially increasing the volume of sound which would be `otherwise obtained in such connection. The means whereby these ends are attained are shown in the accompanying drawings, of which- Figure l represents two acoustic telephones connected together by a piece of the improved cable. Eig. 2 represents an enlarged perspective view of a piece of a cable; and Fig. 3 represents a cross-section of the cablewire, showing the outer envelope of wires and the fibrous central damper or core.

a a c, Eig. 2, are wires, which maybe made of any suitable metal, and are twisted about a central fibrous core or damper, l). The said core l) is preferably saturated with a composition which does not dry up or become hard, it being found that any substance which hardens by exposure or otherwise causes the cable to become rigid, and the transmission of vibrations is thereby impaired.

I do' not limit myself to any particular composition, but prefer a compound of tar with paraffme, petroleum, or vaseline.

I am aware that cordage has been made of wires interlaid with rope-strands, and the whole saturated or covered with tar, therefore do not claim the invention of a cable so constructed.

I am also aware that a wire cable has been used for telephonie purposes, said cable beingl covered with paint, tbc., and that cables composed of wires having a fibrous covering or envelope have been used. This is not the instance of a mere selection of materials in a single integral thing-as, for example, the selection of one kind of wood instead of another for use in the construction of a violin, or of onekind of elast-icmaterial instead of another, as in the case of the springs of a corset. My invention differs from all such instances in combining two distinct integers, one of which is changed in its action, result, and utility when connected with the other. By means of such combination I sesure an increased conductivity of sound, and the non-conductivity of metallic external vibrations, which renders the transmission of speech much louder and clearer and distincter, which principle of operation and which resulting advantage cannot otherwise be secured, but

lYhat I claim as new, and desire to secure by Letters Patent, is-

l. The combination of a diaphagm ot' a telephonie instrument with one or more metallic wires connected thereto, which wire or wires are wound around, inclosed, or are impacted upon a fibrous core, as above described.

2. The combination of a diaphragm of a telephonie instrument with one or more metallic wires connected thereto, which wire or wires are wound around, inclosed, or are impacted upon a iibrous core saturated with a water-repellent viscid material, as above described.

Signed at New York, in the county of New York and State of New York, this 2d day of July, A. D. lSSS.

GEORGE FREDERHYK SIIAYER. lYi tnesses:

l-`. ll. WALKER,

B. F. Gmc/HEM..

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